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I ported (as in rewrote) a C bigint library to Lua. It only covers
the basics, but it's written in pure Lua, no C binding, and it's
fairly quick. I figured it may be useful to someone if you want to
avoid external dependencies. I think it works, but was still fixing
bugs recently, so user beware.
Lua code here: http://bitbucket.org/tedu/bigintlua/src/tip/bigint.lua
C original from here: http://www.acme.com/software/bigint/